The layer’s parameters:
Blending Options>Gradient Overlay

Gradient’s parameters:

Blending Options>Stroke

Gradient’s parameters:

Selecting the same instrument, it’s possible to create an element that we’ll consider to be the ball’s volume. Change the shape a little, moving the tops also with Convert Point Tool.

The layer’s parameters:
Blending Options>Inner Glow

Blending Options>Gradient Overlay